wap forum php code in question for help!

Made a wap forum with PHP code written.Currently landing home when the show "Welcome, XXX" I want to welcome you into a time period divided by Good morning, good afternoon, good evening. Such a display format.Request expert to improve the code to fill in, thank you ~Currently code is: [Note there is a registered unregistered judgment]if ($ groupid == $ wapnewgroupid) {echo ' registered nickname [free] </ a>';} Else {echo "Welcome, $ discuz_user </ a>';}